Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 7552] Add support for EDNS0 option from draft-vandergaast-edns-client-subnet-0

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https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7552

Jakub Zawadzki <darkjames-ws@xxxxxxxxxxxx> changed:

           What    |Removed                     |Added
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                 CC|                            |darkjames-ws@xxxxxxxxxxxx

--- Comment #7 from Jakub Zawadzki <darkjames-ws@xxxxxxxxxxxx> 2012-08-30 10:52:41 PDT ---
Guys,

This looks pretty dangerous: 
  tvb_memcpy(tvb, ip_addr.bytes, cur_offset, (optlen - 4));

optlen is fetched from tvb, and it only needs to be smaller than rropt_len.
When optlen < 4 tvb_memcpy() should throw exception, but with optlen > 16
(sizeof ip_addr) we'll have buffer overflow.

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